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I think that we can distinguish (from the previous photo) three basic colours/shades by horsebox:
a) light tan
b) light brown
c) darker brown

There are two colours/shades of the cab:
a) light red
b) darker red

There is one unknown variation, predicted by Nick some time ago . By the relatively rare model with BPW there are two variations of BPW:
a) ø7,5 x 18
b) ø8 x 18.
This variation is easily overlooked because the difference in diameter is small, and moreover, everyone who has this relativelly rare variation with BPW is happy to have it in his own and perhaps no longer does not inspect the wheel diameter.
Antonin